Re: Firebird and PostgreSQL at the DB Corral.

> >
> > What, exactly, is a partial index? A functional index is an index on
> > something like ((ColumnX*2)/14)? I think the functional one (is that
> > also an expression index?) is on the way.
>
> A partial index is a index on a subset of a table. The case I can think of
> is a list of transactions, some of which are yet to be billed. They have a
> BillID field which is NULL. since this is the recent set it is queried quite
> often, so you can build an index like:
>

Are NULLs even indexed?

    Jeff Davis